[Enhancement] Folder for plexdrive on non encrypted mount

Please, modify plexdrive upload script to allow / fix mount the folder specified in RCLONE_CLOUD_ENDPOINT if encryption are disabled.
Actually:
plexdrive $mongo $plexdrive_options "${cloud_dir}" &
Fixed:
We need to determine folder id or use another environment like PLEXDRIVE_CLOUD_ENDPOINT 
plexdrive $mongo $plexdrive_options "${cloud_dir}" --root-node-id $folder_id_to_mount &